Weird Problem

I have a strange problem though. When I try to connect to the internet at school through WEP it tells me to restart before pressing continue. Once I do that the little window that has the continue button is not there anymore and I have to do that network diagnostics thing again and the same thing repeats.

So not only is this a newbie question but it was also a bit embarrassing that I could not get on the net in class. I didn't represent Mac users too well heh. :/